trace

func HTTPToContext ¶

func HTTPToContext(tracer opentracing.Tracer, req *http.Request, operationName string) context.Context

HTTPToContext returns an http RequestFunc that tries to join with an OpenTracing trace found in `req` and starts a new Span called `operationName` accordingly. If no trace could be found in `req`, the Span will be a trace root. The Span is incorporated in the returned Context and can be retrieved with opentracing.SpanFromContext(ctx).